Want to be a part of the world’s largest picnic?On April 22 from 11 a.m. to 3 p.m., the Nature Conservancy’s Alabama chapter will host Picnic for the Planet: A Celebration of Earth Day at Railroad Park. The event will include food, live music and kids’ activities. Picnic tables decorated by local artists will be on display. It’s part of a national effort to set a record for the world’s largest picnic, with other chapters picnicking simultaneously. Be there by 1 p.m. to help set the record.